/*
This is borrowed from koodo-reader https://github.com/troyeguo/koodo-reader/tree/master/src
*/

export const isTitle = (line, isContainDI = false, isContainChapter = false, isContainCHAPTER = false) => {
  return (
    line.length < 30 &&
    line.indexOf('[') === -1 &&
    line.indexOf('(') === -1 &&
    (line.startsWith('CHAPTER') ||
      line.startsWith('Chapter') ||
      line.startsWith('序章') ||
      line.startsWith('前言') ||
      line.startsWith('声明') ||
      line.startsWith('聲明') ||
      line.startsWith('写在前面的话') ||
      line.startsWith('后记') ||
      line.startsWith('楔子') ||
      line.startsWith('后序') ||
      line.startsWith('寫在前面的話') ||
      line.startsWith('後記') ||
      line.startsWith('後序') ||
      /(?=[MDCLXVI])M*(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[XV]|V?I{0,3})$/.test(line) ||
      (line.startsWith('第') && startWithDI(line)) ||
      (line.startsWith('卷') && startWithJUAN(line)) ||
      startWithRomanNum(line) ||
      (!isContainDI && !isContainChapter && !isContainCHAPTER && line.indexOf('第') > -1 && (line[line.indexOf('第') - 1] === ' ' || line[line.indexOf('第') - 1] === '　' || line[line.indexOf('第') - 1] === '、' || line[line.indexOf('第') - 1] === '：' || line[line.indexOf('第') - 1] === ':') && startWithDI(line.substr(line.indexOf('第')))) ||
      (!isContainDI && !isContainChapter && !isContainCHAPTER && line.indexOf(' ') && startWithNumAndSpace(line)) ||
      (!isContainDI && !isContainChapter && !isContainCHAPTER && line.indexOf('　') && startWithNumAndSpace(line)) ||
      (!isContainDI && !isContainChapter && !isContainCHAPTER && line.indexOf('、') && startWithNumAndPause(line)) ||
      (!isContainDI && !isContainChapter && !isContainCHAPTER && line.indexOf('：') && startWithNumAndColon(line)) ||
      (!isContainDI && !isContainChapter && !isContainCHAPTER && line.indexOf(':') && startWithNumAndColon(line)))
  )
}
const startWithDI = (line) => {
  let keywords = ['章', '节', '回', '節', '卷', '部', '輯', '辑', '話', '集', '话', '篇']
  let flag = false
  for (let i = 0; i < keywords.length; i++) {
    if ((line.indexOf(keywords[i]) > -1 && (line[line.indexOf(keywords[i]) + 1] === ' ' || line[line.indexOf(keywords[i]) + 1] === '　' || line[line.indexOf(keywords[i]) + 1] === '、' || line[line.indexOf(keywords[i]) + 1] === '：' || line[line.indexOf(keywords[i]) + 1] === ':')) || !line[line.indexOf(keywords[i]) + 1]) {
      if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(1, line.indexOf(keywords[i])).trim()) || /^\d+$/.test(line.substring(1, line.indexOf(keywords[i])).trim())) {
        flag = true
      }
      if (flag) break
    }
  }
  return flag
}
const startWithJUAN = (line) => {
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(1, line.indexOf(' '))) || /^\d+$/.test(line.substring(1, line.indexOf(' ')))) return true
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(1, line.indexOf('　'))) || /^\d+$/.test(line.substring(1, line.indexOf('　')))) return true
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(1)) || /^\d+$/.test(line.substring(1))) return true
  return false
}
const startWithRomanNum = (line) => {
  if (/(?=[MDCLXVI])M*(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[XV]|V?I{0,3})$/.test(line.substring(0, line.indexOf(' ')))) return true
  if (/(?=[MDCLXVI])M*(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[XV]|V?I{0,3})$/.test(line.substring(0, line.indexOf('.')))) return true
  if (/(?=[MDCLXVI])M*(C[MD]|D?C{0,3})(X[CL]|L?X{0,3})(I[XV]|V?I{0,3})$/.test(line.trim())) return true
  return false
}
const startWithNumAndSpace = (line) => {
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(0, line.indexOf(' ')))) return true
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(0, line.indexOf('　')))) return true

  if (/^\d+$/.test(line.substring(0, line.indexOf(' ')))) return true
  if (/^\d+$/.test(line.substring(0, line.indexOf('　')))) return true
  return false
}
const startWithNumAndColon = (line) => {
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(0, line.indexOf(':')))) return true
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(0, line.indexOf('：')))) return true

  if (/^\d+$/.test(line.substring(0, line.indexOf(':')))) return true
  if (/^\d+$/.test(line.substring(0, line.indexOf('：')))) return true
  return false
}
const startWithNumAndPause = (line) => {
  if (/^[\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u842c]+$/.test(line.substring(0, line.indexOf('、')))) return true

  if (/^\d+$/.test(line.substring(0, line.indexOf('、')))) return true
  return false
}

class HtmlParser {
  bookDoc
  contentList
  contentTitleList
  constructor(bookDoc) {
    this.bookDoc = bookDoc
    this.contentList = []
    this.contentTitleList = []
    this.getContent(bookDoc)
  }
  getContent(bookDoc) {
    this.contentList = Array.from(bookDoc.querySelectorAll('h1,h2,h3,h4,h5,b,font')).filter((item, index) => {
      return isTitle(item.innerText.trim())
    })

    for (let i = 0; i < this.contentList.length; i++) {
      let random = Math.floor(Math.random() * 900000) + 100000
      this.contentTitleList.push({
        label: this.contentList[i].innerText,
        id: 'title' + random,
        href: '#title' + random,
        subitems: []
      })
    }
    for (let i = 0; i < this.contentList.length; i++) {
      this.contentList[i].id = this.contentTitleList[i].id
    }
  }
  getAnchoredDoc() {
    return this.bookDoc
  }
  getContentList() {
    return this.contentTitleList.filter((item, index) => {
      if (index > 0) {
        return item.label !== this.contentTitleList[index - 1].label
      } else {
        return true
      }
    })
  }
}

export default HtmlParser